When starting from scratch, install Chia with these instructions: https://github.com/Chia-Network/chia-blockchain/wiki/INSTALL#ubuntudebian

Ensure your node and wallet are fully synced

Your wallet needs at least 1 Mojo to join a pool. Use https://faucet.chia.net/ if you don't have 0.000000000001 XCH (1 Mojo)

Create the pool wallet:

chia plotnft create -u https://xch.spacefarmers.io -s pool

Check details and confirm with Y

Check if your pool wallet is activated:

chia plotnft show

It can take up till 2 minutes for the pool wallet to show up.

Copy Pool contract address (or P2 singleton address in older versions)

Create your first pool plot:

chia plots create -t /temp/directory/ -d /final/directory -c [POOL CONTRACT]